SU1441205A1 - Electronic converter for variable-induction pickups - Google Patents

Abstract

The invention relates to measurement technology and can be used in active control devices, in measuring systems of control and sorting machines, in adaptive control systems using inductive sensors. The purpose of the invention, the extension of the measurement range, is achieved by increasing the linear portion of the working characteristic. The device contains an inductive differential sensor 1, an amplitude-phase discriminator- (AFD) 2, a DC amplifier 3 and a measuring device 4, the AFD contains voltage amplifiers 5 and 6, diodes 7 and 8, resistors and a capacitor. The proposed electronic converter allows the use of a bridgeless circuit, thereby expanding the working section with high linearity of the conversion characteristic. At the same time, the design of the device is simplified, the cost is reduced, and the measurement accuracy is increased by an order of magnitude, 1 Il. (L

Description

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The invention relates to a measuring technique and can be used in active control devices in measuring systems of control-sorting pmh machines, in adaptive control systems using inductive sensors.

The aim of the invention is to expand the measurement range by increasing the linear portion of the working characteristic.

The drawing shows a diagram of the proposed device.

The device contains an inductive differential sensor 1, an amplitude-phase discriminator (AFD) 2, a DC amplifier 3 (UFD) and a measuring device 4, the extreme and middle terminals of the inductive differential sensor 1 being connected respectively to three AFD 2 inputs, the output of which is through UFT 3 is connected to the measuring device 4.

AFD 2 contains voltage amplifiers 5, 6, diodes 7, 8, resistors 9, 10, and capacitor 11, the inverting inputs of voltage amplifiers 5, 6 being connected respectively to the first and second inputs of the AFD 2, the third input of which is connected to non-inverting inputs of voltage amplifiers 5, 6, the outputs of which through diode 7 in reverse switch and on diode 8 in direct connection, respectively, are connected to the first terminals of resistors 9, 10 and capacitor plates 11, the second terminals of resistors 9, 10 are connected with the release of afd 2.

The device operates as follows.

Depending on the position of the rod of the differential inductive sensor 1. the resistance of its shoulders Z

one

and Z / ji can take any positive values above +1. Sensor 1 is powered by a sinusoidal voltage (frequency 1.0 to 10.0 kHz) and serves as a power source for a voltage divider. The voltage taken from the divider is fed to the amplitude-phase discriminator 2, namely, the first and second voltage amplifiers 5, 6, which are included in the inverting software and

noninverting circuits with coefficients with an amplitude-phase output. Discrete gain 1-3 (depending on

minator

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h 0

50

0

five

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converter assignment). The amplified signals of different polarity are detected, respectively, each by its diode 7, 8, and both signals are received. common to them is a resistive-capacitance filter, resistors 9, 10 and a capacitor 31 with a midpoint. Further, the signal converted to a DC voltage, which is amplified by the DC amplifier 3, is fed to the measuring device 4.

The proposed electronic converter permits the use of a bridgeless scheme, thereby expanding the working section with high linearity of the conversion characteristic, in addition, the device circuit is simplified, the cost is reduced, the measurement accuracy increases by an order of magnitude.

Claims (1)

Invention Formula An electronic transducer for inductive sensors, comprising an inductive differential sensor and a series-connected DC amplifier and measuring device, characterized in that, in order to expand the measuring range by increasing the linear portion of the operating characteristic, the amplitude-phase discriminator is introduced into it, the inputs of which are connected respectively to the two extreme and middle terminals of the inductive sensor, and the output is connected to the input of the DC amplifier, the amplitude-phase vy discriminator comprises two voltage amplifier, two diodes, two resistors and a capacitor. moreover, the inverting inputs of voltage amplifiers are connected respectively to the first and second inputs of the amplitude-phase discriminator, the third input of which is connected to the non-inverting inputs of voltage amplifiers, the outputs of which through the first diode in reverse switching and the second diode in direct switching respectively are connected to the first outputs of both resistor and capacitor plates, the second terminals of the resistors are connected with exit minator